From: Seattle, WA
This is mainly about male chastity but I'm pretty sure it can be translated for various genders.
Devotional Sex: a system where the "Knight" determines how many orgasms they/he'd like to have per week / month / season, and the "Princess" acts as a sort of sexy manager / coach / cheerleader to keep the Knight on track and feeling appreciated while the Princess reaps rewards of more sensual attention and sex that they/she initiates that focuses on them/her. (https://devotionalsex.com)
Be Careful What You Wish For: a book by Sarah Jameson. In this book, (mostly device-driven) chastity is presented to couples for whom D/s isn't an issue. The person in chastity isn't submitting to the key holder: it's simply orgasm management, tease and denial, and release. Jameson insists repeatedly that she is not a dominant, just a key holder. Good for people skittish of a power imbalance in a relationship even if the chastity part sounds hot. (https://www.amazon.com/Be-Careful-What-You-Wish-ebook/dp/B08Q3VBBZN)